CVE-2026-64134

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: Don't setup bogus iov_iter for silencing

At transition to the iov_iter for PCM data transfer, we blindly applied the iov_iter setup also for silencing (i.e. data = NULL), and it leads to a calculation of bogus iov_iter. Fortunately this didn't cause troubles on most of architectures but it goes wrong on RISC-V now, causing a NULL dereference.

Handle the NULL data case to treat the silencing in interleaved_copy() for addressing the bug above. noninterleaved_copy() has already the NULL data handling, so it doesn't need changes.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxcf393babb37a1679a1ec1d864df1090353465e23 < 41a766c647294842c9b17672449f8e011048cba9affected
LinuxLinuxcf393babb37a1679a1ec1d864df1090353465e23 < ce836587e594af39ff048d9b29dee0f5f10692c9affected
LinuxLinuxcf393babb37a1679a1ec1d864df1090353465e23 < feff0251386aa6bb180a0a1cf7c1f91ba868113daffected
LinuxLinuxcf393babb37a1679a1ec1d864df1090353465e23 < c9f6768515818d71bdfc20119a81f3332c53b9c6affected
LinuxLinuxcf393babb37a1679a1ec1d864df1090353465e23 < e4d3386b74fba8e01280484b67ee481ece00201eaffected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.142 <= 6.6.*unaffected
LinuxLinux6.12.92 <= 6.12.*unaffected
LinuxLinux6.18.34 <= 6.18.*unaffected
LinuxLinux7.0.11 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References